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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287d85f4cf746ef6b84f70eff71c67c9b256563a75652344d7e162f1f77aba78' 
  AND token = 'xCKvHEJEFRP6ob35mPLYHALxXCJhzNwDRsduU2FkX60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}